Q34. Why during winter more fog occurs in areas where more trees
Plants releases water in the form of water vapor into the air through the
process of transpiration. This vapor condenses to form fog. Areas where more
trees are there, more transpiration will occur and hence there is more formation
Q35. List 3 ways to conserve water.
Ways to conserve water:
Collecting and storing rainwater for later
Turning the water off when brushing teeth or
washing utensils can save a lot of water.
Using of sprinkler system for watering the
Q36. Why monsoon is so important?
Monsoon is important because
Most of the rainfall occurs during the
Rains bring relief especially after hot
Sowing of many crops depends on the arrival
Q37. Why are rains important to us?
Rain is a major component of the water cycle. Many forms of
land-based life depend on fresh water, which comes from rain. The
rainwater also fills up the lakes and ponds. A part of the rainwater seeps into
the ground. Most of this water becomes available to us as ground water.
Q38. Think and write some more use of water, apart from water
used in our daily activities.
Other uses of water
Plants also need water for photosynthesis.
Photosynthesis is what plants do to prepare their food, and water is critical
to this process.
Water is used in industries for producing
almost all the things that we use.
Q39. What is spring water?
A part of the rainwater collects over the rocks under the earth.
due to pressure, this water naturally comes out of the earth’s surface in the
form of a spring from any available opening. This water is called spring water.
Q40. Why do we see water droplets (dew) on leaves in winter?
Ans. On a warm day, water
evaporates from the warm ground into the air. In night the warm ground continues
to radiate heat into the air. As the ground begins to cool, the air will not be
able to hold all the moisture. Water vapor in the air will begin to condense. That's
why we see water droplets on leaves in winter.
Q41. What happens if it does not rain for a long period?
No, rain for a long period can cause the following:
The soil becomes dry.
The level of water in ponds and wells of
the region goes down and some of them may even dry up.
The ground water may also become scarce.
This may lead to drought.
Q42. The process of condensation plays an important role in
bringing water back to the surface of earth. How does it happen?
When the air moves up, it gets cooler and cooler. At sufficient heights, the
air becomes so cool that the water vapor present in it condenses to form tiny drops
of water called droplets. It so happens, that many droplets of water come
together to form larger sized drops of water. Some drops of water become
so heavy that they begin to fall. These falling water-drops are called rain.
Q43. Write a short note on importance of water.
Water is one of the most vital substances on earth. All living being need water
to survive. Apart from drinking it to survive, people have many other uses for
of the most common uses of water are:
For cooking, bathing, cleaning and washing.
For generating steam in boilers.
For generating hydroelectricity.
Q44. What are the effects of excess rainfall in an area?
Excess of rainfall may lead to many problems. Heavy rains may lead to rise in
the level of water in rivers, lakes and ponds. The water may then spread over
large areas causing floods. The crop fields, forests, villages, and cities may
get submerged by water. Flood cause extensive damage to crops, domestic animals,
property and human life.
Q45. What causes drought?
Even if it does not rain in a region for a year or more, the soil continues to
lose water by evaporation and transpiration. Since it is not being brought back
by rain, the soil becomes dry. The level of water in ponds and wells of the
region goes down and some of them may even dry up. The ground water may also
become scarce. This may lead to drought.
Q46. What is rainwater harvesting? Explain the two method of
Rain water harvesting is a method used for collection and storage of rainwater
into natural reservoirs or tanks for later use.
two method of rainwater harvesting are:
Rooftop rainwater harvesting: In this
system the rainwater is collected from the rooftop to a storage
tank, through pipes.
Another option is to allow water to go into
the ground directly from the roadside drains that collect rainwater.